fix kafkaBridge headers sent error

Author: mipyykko

backend/bin/kafkaBridge.ts

@@ -83,16 +83,16 @@ app.post("/kafka-bridge/api/v0/event", async (req, res) => {
 
   try {
     producer.produce(topic, null, Buffer.from(JSON.stringify(payload)))
-    flushProducer(1000).catch((err) => {
-      logger.warn(new KafkaError("Flushing the producer failed", err))
-      return res.status(500).json({ error: err.toString() }).send()
-    })
+    return flushProducer(1000)
+      .then(() => res.json({ msg: "Thanks!" }).send())
+      .catch((err) => {
+        logger.warn(new KafkaError("Flushing the producer failed", err))
+        return res.status(500).json({ error: err.toString() }).send()
+      })
   } catch (e: any) {
     logger.error(new KafkaError("Producing to kafka failed", e))
     return res.status(500).json({ error: e.toString() }).send()
   }
-
-  return res.json({ msg: "Thanks!" }).send()
 })
 
 app.get("/kafka-bridge/api/v0/healthz", (_, res) => {